Y3 - This book is new to the list but not in the PD. A Drop of Water: A Book of Science and Wonder by Walter Wick

Y3 - All these books are no longer on the list: Explore His Earth by Ann Voskamp Science Lab in a Supermarket by Robert Friedhoffer. All About Famous Inventors and Their Inventions by Fletcher Pratt. Exploring Creation With . . . series by Jeannie Fulbright.

Y3/Y3.5 - Ways of Wood Folk by William J. Long belongs on Y3.5 instead of Y3.